[ 927.981996][T21381] [ 927.982170][T21381] ============================= [ 927.982716][T21381] WARNING: suspicious RCU usage [ 927.982903][T21381] 7.0.0-rc1-virtme #1 Not tainted [ 927.983104][T21381] ----------------------------- [ 927.983304][T21381] net/ipv6/ip6_fib.c:111 suspicious rcu_dereference_protected() usage! [ 927.983557][T21381] [ 927.983557][T21381] other info that might help us debug this: [ 927.983557][T21381] [ 927.983870][T21381] [ 927.983870][T21381] rcu_scheduler_active = 2, debug_locks = 1 [ 927.984132][T21381] 1 lock held by ip/21381: [ 927.984336][T21381] #0: ffffffff8d27e6e8 (rtnl_mutex){+.+.}-{4:4}, at: rtm_new_nexthop+0x1a6/0x8c0 [ 927.984635][T21381] [ 927.984635][T21381] stack backtrace: [ 927.984853][T21381] CPU: 2 UID: 0 PID: 21381 Comm: ip Not tainted 7.0.0-rc1-virtme #1 PREEMPT(full) [ 927.984858][T21381] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 927.984859][T21381] Call Trace: [ 927.984862][T21381] [ 927.984864][T21381] dump_stack_lvl+0x6f/0xa0 [ 927.984871][T21381] lockdep_rcu_suspicious.cold+0x4f/0xad [ 927.984877][T21381] fib6_update_sernum+0xfb/0x130 [ 927.984881][T21381] nh_rt_cache_flush+0x8d/0x380 [ 927.984885][T21381] replace_nexthop+0x347/0x6e0 [ 927.984891][T21381] insert_nexthop+0x41e/0x7a0 [ 927.984898][T21381] rtm_new_nexthop+0x3a0/0x8c0 [ 927.984903][T21381] ? insert_nexthop+0x7a0/0x7a0 [ 927.984905][T21381] ? lock_acquire.part.0+0xbc/0x260 [ 927.984909][T21381] ? find_held_lock+0x2b/0x80 [ 927.984918][T21381] ? lock_acquire.part.0+0xbc/0x260 [ 927.984920][T21381] ? find_held_lock+0x2b/0x80 [ 927.984927][T21381] ? find_held_lock+0x2b/0x80 [ 927.984929][T21381] ? insert_nexthop+0x7a0/0x7a0 [ 927.984931][T21381] ? __lock_release.isra.0+0x59/0x170 [ 927.984935][T21381] ? insert_nexthop+0x7a0/0x7a0 [ 927.984937][T21381] rtnetlink_rcv_msg+0x6fe/0xb90 [ 927.984942][T21381] ? rtnl_fdb_dump+0x620/0x620 [ 927.984944][T21381] ? __lock_acquire+0x577/0xc10 [ 927.984948][T21381] ? lock_acquire.part.0+0xbc/0x260 [ 927.984949][T21381] ? find_held_lock+0x2b/0x80 [ 927.984952][T21381] netlink_rcv_skb+0x123/0x380 [ 927.984956][T21381] ? rtnl_fdb_dump+0x620/0x620 [ 927.984959][T21381] ? netlink_ack+0xcc0/0xcc0 [ 927.984965][T21381] ? netlink_deliver_tap+0xc5/0x330 [ 927.984967][T21381] ? netlink_deliver_tap+0x13f/0x330 [ 927.984972][T21381] netlink_unicast+0x4a3/0x770 [ 927.984976][T21381] ? netlink_attachskb+0x810/0x810 [ 927.984978][T21381] ? __alloc_skb+0x4cd/0x600 [ 927.984981][T21381] ? napi_skb_cache_get+0x7a0/0x7a0 [ 927.984984][T21381] ? __lock_acquire+0x577/0xc10 [ 927.984987][T21381] netlink_sendmsg+0x735/0xc60 [ 927.984991][T21381] ? netlink_unicast+0x770/0x770 [ 927.984995][T21381] ? __might_fault+0x97/0x140 [ 927.985001][T21381] ____sys_sendmsg+0x419/0x850 [ 927.985004][T21381] ? copy_msghdr_from_user+0x270/0x430 [ 927.985006][T21381] ? get_timestamp.constprop.0+0x3a0/0x3a0 [ 927.985007][T21381] ? move_addr_to_kernel+0x40/0x40 [ 927.985011][T21381] ? lock_acquire.part.0+0xbc/0x260 [ 927.985013][T21381] ? find_held_lock+0x2b/0x80 [ 927.985016][T21381] ___sys_sendmsg+0xfd/0x180 [ 927.985018][T21381] ? copy_msghdr_from_user+0x430/0x430 [ 927.985020][T21381] ? __lock_release.isra.0+0x59/0x170 [ 927.985031][T21381] ? lock_vma_under_rcu+0x128/0x3e0 [ 927.985036][T21381] __sys_sendmsg+0x124/0x1c0 [ 927.985044][T21381] ? __sys_sendmsg_sock+0x20/0x20 [ 927.985050][T21381] ? do_user_addr_fault+0x799/0xdb0 [ 927.985054][T21381] ? rcu_is_watching+0x15/0xd0 [ 927.985058][T21381] ? rcu_is_watching+0x15/0xd0 [ 927.985061][T21381] do_syscall_64+0x117/0xfc0 [ 927.985066][T21381] ? exc_page_fault+0xaf/0xd0 [ 927.985069][T21381] entry_SYSCALL_64_after_hwframe+0x4b/0x53 [ 927.985072][T21381] RIP: 0033:0x7faebc3e7c5e [ 927.985076][T21381] Code: 4d 89 d8 e8 34 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 c3 83 e2 39 83 fa 08 75 e7 e8 13 ff ff ff 0f 1f 00 f3 0f 1e fa [ 927.985078][T21381] RSP: 002b:00007ffc66ea9970 EFLAGS: 00000202 ORIG_RAX: 000000000000002e [ 927.985081][T21381] RAX: ffffffffffffffda RBX: 000000000048a910 RCX: 00007faebc3e7c5e [ 927.985083][T21381] RDX: 0000000000000000 RSI: 00007ffc66ea9a30 RDI: 0000000000000005 [ 927.985084][T21381] RBP: 00007ffc66ea9980 R08: 0000000000000000 R09: 0000000000000000 [ 927.985084][T21381] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000001 [ 927.985085][T21381] R13: 0000000069a48465 R14: 00007ffc66eaa528 R15: 000000000049b620 [ 927.985092][T21381]